Verified Solution • 2025–26 Session moderate

QJEEM23Ch1c70: JEE Main 2023 Chemistry - Class 11 JEEM23Ch1c70 Solution: The correct order of hydration enthalpies is (A) K (B) Rb (C)…

The correct order of hydration enthalpies is

(A) K +^+

(B) Rb +^+

(C) Mg 2+^{2+}

(D) Cs +^+

(E) Ca 2+^{2+}

Choose the correct answer from the options given below :

Multiple Choice Options

  • A E > C > A > B > D
  • B C > A > E > B > D
  • C C > E > A > D > B
  • D C > E > A > B > D

Step-by-Step Verified Solution

Hydration enthalpy ∝\propto charge density

Charge density means Magnitude of ChargeIonic Radius{{Magnitude\,of\,Charge} \over {Ionic\,Radius}} .

∴\therefore The correct order of charge density is

\mathrm{Mg}^{2+}>\mathrm{Ca}^{2+}>\mathrm{K}^{+}>\mathrm{Rb}^{+}>\mathrm{Cs}^{+}

∴\therefore The order of hydration enthalpy

C>E>A>B>D

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